Why do you make such a statement? Do you have a link to where scholars have said it was composed from different other suttas?

with mettaChris

---The trouble is that you think you have time------Worry is the Interest, paid in advance, on a debt you may never owe------It's not what happens to you in life that is important ~ it's what you do with it ---

So in this way quite a lot of important teachings and traditions gotincorporated into this constantly expanding 'Mahaparinibbana Sutta', even quite late material,which later people, later monks, wanted to sort of tack onto the Buddha's teaching - they all foundtheir place there, to give them a sort of authority and especially if it was about what the Buddha hadsaid immediately before passing away, as part of his last message, it was of special importance. Inthis way, as the translator says, "this suttanta is a composite work containing loosely assembledmaterial of various dates." Some of the material in this sutta is very old, no doubt going back to theBuddha himself. Other material may be a hundred, two hundred years later.

Rhys Davids, however, points out that only one third of the Sutta is original while the rest of the passages are found in identical or almost identical words elsewhere inthe canon. He is convinced of the gradual growth of living traditions. He says: “It is well known that all the ancient sacred literatures of the world have grown up gradually,and are a mosaic of earlier and later material. The Buddhist Pitakas form no exception.”

"And how is it, bhikkhus, that by protecting oneself one protects others? By the pursuit, development, and cultivation of the four establishments of mindfulness. It is in such a way that by protecting oneself one protects others.

"And how is it, bhikkhus, that by protecting others one protects oneself? By patience, harmlessness, goodwill, and sympathy. It is in such a way that by protecting others one protects oneself.- Sedaka Sutta [SN 47.19]